Heat oven to 375°F. Line 15x10x1-inch pan with foil or waxed paper; grease with shortening or cooking spray. In small bowl, beat eggs with electric mixer on high speed about 5 minutes or until very thick and lemon colored. Pour eggs into large bowl; gradually beat in 1 cup granulated sugar. Beat in 1/3 cup water and the vanilla on low speed. Gradually add flour, baking powder and salt, beating just until batter is smooth. Pour into pan, spreading batter to corners.